package com.heima.filter;

import com.heima.gateway.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter{

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //1.2判断是否为登录请求
        if(request.getURI().getPath().contains("/login")){
            //是登录请求,放行
          return  chain.filter(exchange);
        }
        //不是登录请求,则需要校验token
        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            //token不存在,返回错误401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5.存在,判断是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否过期
            int verifyToken = AppJwtUtil.verifyToken(claimsBody);
            if(verifyToken==1||verifyToken==2){
                //token已经过期
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //6.放行
        return chain.filter(exchange);
    }
    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
